Protective curtain for furnaces



Aug. 2,1927. 1,638,004 J. L. SCHULTZ PROTECTIVE CURTAIN FOR FURNACES 5Sheets-Sheet 1 Filed July 3, 1923 v 1 f u Aug.. 2 1927,

,l. L. SCHULTZ PROTECTIVE CURTAIN FOR FURNACES Filed July is, 1923 5'Sheets-Sheet 2 IMW JZn/L .15 M2.

Aug. 2,1927.

1,638,004 J. L. SCHULTZ PROTECTIVE CURTAIN FOR FURNACES Filed July 5,1923 5 Sheets-Sheet 3 IwW JOZWL 6M2.

Aug. 2,1927. 1,638,004

J. L. SCHULTZ PROTECTIVE cunmm FOR FURNACES Filed July 5. 1923 5Sheets-Sheet 4 1,638,004 J. L. SCHULTZ PROTECTIVE CURTAIN FOR FURNACES IFile ly 1923 5 Sheets-Sheet 5 QQN IEi w m Q mkwmw w R Q Q m5 PatentedAug. 2, 3 1927.

UNITED-STATES :PATENT OFFICE.

JOHN SCHULTZ, OF PHILADELPHIA, PENNSYLVANIAJASS IGNOR TO AMERICANENGINEERING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

PROTECTIVE CURTAIN FOR FURNACES.

Application filed July 8, 1928. Serial No. 649,237.

One object of my invention to provide a moving curtain for use infurnaces, where ordinarily there would be a formation of clinkeradhering to the furnace lining. and

5. the invention more especially contemplates a traveling curtain madeof metal sections positioned to replace such portions of the lining aswould commonly be attacked or engaged by the clinker. The inventionfurther contemplates a construction 'in which the curtain sectionssuccessively enter the.

zone of high temperatures where they remain for a limitedtime only, andthen move.

out of said zone so as to be permitted to cool.

Another object of my invention is to provide a novel form of wall forthe ash pocket or ash discharge end of a furnace, of such constructionas. to constantly present to the I 2 heated fuel and ash, relativelycool sections and thereafter remove these when they have become heated,to allow them to cool.

I also desire to provide a furnace with a curtain-like wall presentingto the ash or clinkerrelatively cool moving sections tending to break upclinkers as well as prevent,

their. adherence.

The invention also includes novel means for sup orting,moving andcooling the secso tions 0 a furnace curtain wall. v

A further object of my invention is to provide a furnacewith a wallstructure so constructed and positioned. as to. facilitate the movementof the ash toward the place of 85 discharge thereof and the inventionalso is designed to provide a traveling curtain formed of sectionsconstructed 'to receive and carry water as they -move into vand throughthe zone of high temperature with a view to preventing their belngobjection- ,ably heated before they pass out of said zone.

These objects and other advantageous ends I attain as hereinafter setforth, reference being had to the accompanying draw- H1 s,'1n whlch,

ig. 1 is a vertical section of a portion of.

' a furnace showing my invention as applied thereto; Fig. 2 is anelevation, partially diagrammatic, of certain of the'structures shown inFig. 1; 1 p p Figs. 3 and 4: are respectively front and end elevationsof one of the curtain sec- .each two pairs serve to supportf-t'woparallel tions of my invention and certain of the links associatedtherewith Fig. 4 showing a part in section; v 1 a Fig. 5 is a verticalsection similar to that of Fig. 1,' showing a modified form of. myinvention as applied to .the ash pocket of an inclined underfeed stoker,portions of which are indicated diagrammatically;

Figs. (Sand 7 are respectively front and end elevations, showing thedetail construction of the' curtain sections of that form of theinvention shown in Fig. 5.

Fig. 8 is a'vertical section similar to those of Figs 1 and 5,illustrating another modificd form of the invention; and v Fig. 9is afront elevation of a portion of 7 the structure shown in Fig. 8 withcertain parts broken away.

In Figs. 1, to4 inclusive of the above drawings, 1 represents a portionof the brick or concrete setting of a furnace having my inventionapplied to that portion thereof in and 1 adjacent the ash discharge partof the furnace. The latter in the case shown, includes an ash pocket 2,in the bottom'of which are placed ash crushing rolls, of which one isindicated at 3, there being a series of plates of which one is indicatedat 4, pivotally hung on brackets 5 supported in any suitable man nerfrom the setting 1, and extending upwardly for a short distance abovethe crusher rolls. Above the plates land brackets 5, the setting 1 isoverhung, being provided with a top plate6 extending horizontally: abovethe space immediately over said brackets 5 and having horizontal beamsor 90 girders 7 and 8 mounted on or adjacent the substantially verticalface of the recess undlelrlsaid plate 6, with which they are para e.

The girder 7 serves to support aseries of projecting bearing brackets 9,in which is journaled an idler shaft 10, while the beam 8 similarlysupports a series of bearing brackets 11 carrying a power-driven shaft12. These two shafts 10 and 12 are parallel and extend parallel with theash pocket 2. each having mounted upon it a series of pairs ofsp-rocketwheels, indicated respectively at 13 and 14. The sprocket wheels ofendless: chains, each consisting of a series of links 15-16 pivotallyconnected by pintles I7. i

plate sections each connected at its ends by the bolts 19 to a pair ofthe links 16, the width of said plates being such that they present tothe furnace a substantially flat face extending from the upper edge ofthe v plates 4 to the front edge of the top plate v at 21.

6, which is downwardly flanged as indicated That face of each' section20 I which is exposed tov the heat of the furnace is sub stantiallyflat, except at its lower edge whereit is provided with a horizontal,outwardly projecting rib 22. Its rear or inner face has its lowerportion formed to provide a trough or container 23 designed to receivewater delivered from a supply 'pipe 24t extending transversely of thefurnace immediately under the top plate 6 and having outlet openings25,- in the present instance so positioned as to direct streams of wateragainst the inner surface, of the flange 21,- from which said water isfree to fall over the plate sections .20 and collect in their troughs23;

As willbe evident from Fig. 2 any suit 7 and supported-by the shafts 10and912, of

. which the latter is preferably driven by power from any suita lesource, so' that the plates 20' of all the series travel downwardly fromunder the' water supply-pipe 24 and flange 2 1. lhe flat faces of saidplates are thus successively exposed to the hot gases and thereafter tothe ashes and clinkers in the cket 2. 'Under these conditions, it isevident that each of the sec-v tions successively enters the zone ofhigh temperature in the furnace and by reason of' its movement, makes itimpossible, for

clinker or ash to collect upon it. At the (same time theldownwardmovement rof the various sections constituting the exposed run ofmyendless curtain tends to break or crush the clinkers, as well as tofacilitate their movement toward the crushing roll 3 or other dischargepointor' agency of the -.ash pocket. While so exposed to the heat of theburning fuel in the furnace. and hot ash and clinkers, the sections 20of the l in which wardly so that. they have upright exposed face of thecurtain-become more or less heated but by reason of their movement,ultimately pass out of the ash. Pocket into the rear of the chamber orrecess protected run of the curtain they travel upample time to they aremounted, where as the cool before they are again exposed to the furnaceheat. 'Thewater supplied from the I pipe. 24 not only tends to furthercool the sections of the curtain, butalso servesto keep them cool bycollecting intheir troughs 23, from which its evaporation still furthertends to reduce thetemperature of the se.c

tions.

In that form of Fig. 5, I have illustrated a slightly modified form ofprotective curtain and-have'shown this -as applied to the ash pocket 2*of an inclined underfeed stoker, certain of whose tuyeres are indicatedat 30. These tuyeres are arranged in stepped form and below them arecustomarily mounted v stepped. structures 31, having beneath the-m arearinvention shown in wardly inclined face plateq32 defining one sideof the upper part of the ash pocket. Below this structure 32 is a seriesof verti cal plates 33 pivotally hung from brackets 34 in positionssubstantially opposite the' plates-4 on the rear side ofthe pocket '2'cwhose bottom 'in this instance is provided by a pair of crushing rolls3 and 3 In this case each hain is made up wholly of similar links 16? soproportioned that the lower edoe of each of the "plates 20 extendsover-file top edge of the plate next below it, in that part of thecurtain exposed to the hot' gases and ash in the furnace. 'The platesconstituting the curtain sections are preferably wedge-shaped in sectionwith their thinner edges at the top in the exposedface of the curtainand the water supply pipe 24 is provided in such position as to deliveragainst the downwardly extending flange 21 'of the top plate- 6, fromwhence the water falls onthe plate sections and links as these move overthe top sprockets able or desired number of-series of endless curtainsections or curtains may be provided 13 and while they are movingdownwardly. I

In this case the troughs are omitted.

--In that modification ofl'my invention shown in Figs. .8 and 9,- theplates consti tuting the curtain sections. have substantially the sameconstruction as shown in Fig.

6, but in this case they occupy positions the reverse ofthose previouslydescribed,-

that is to say,"they"are so mounted-"on the links 16 that the lower andrelativelythin edge of each plate extends {under the relativelythiok'edge of the plate next below it in that portion which is exposedto the ash and clinkers. J

It-will be noted that each of the plates stoker, it may if desiiied beused to replace or sides thereof, for example 'where "there is apossibility or a likelihood of clinker,

'12:) is-longitudinally slotted for ,thereception any portion of a.,furnace wall-at the back ash or other material in highly heatedcondition attacking or collecting on said wall. In any case the endlesscurtain is operated to successively present tothe heated zone of thefurnace, relatively cool sections and to successively remove and permitthe sections to cool after they have been heated.

I claim:

1. The combination in a furnace of a movable curtain structurepositioned to constitute'a portion of the furnace lining; and means forcooling said curtain structure.

2'. The combination in a furnace of a wall; an endless traveling curtainmounted adjacent said wall'to constitute a portion of the furnacelining; and means for supplying a cooling medium to said curtain.

-3. In a furnace, the combination with a furnace lining; of an endlessmovable sec tional curtain constituting at least one portion of saidlining; andmeans for supplying -a cooling agent to said curtain, atleast one of the sections of said curtain being formed to retain saidcooling agent.

4;" The combination in a furnace of an endless sectional curtain formingpart of the ash-receiving portion; of an endless traveling curtainformed in sections and adapted to constitute a portion of the furnacelining; means for movlng the curtain-to cause its sections to movealternately into and out of the ash-receiving portion; and means forsupplying a cooling agent to said curtain, certain of said curtainsections being formed to hold said cooling agent.

6. In a furnace, the combination with a furnace lining; an endlesssectional curtain constituting at least one portion thereof, certain ofthe sections of said curtain having opposite sides respectively adaptedto be exposed to the heat of the furnace and to serve as receptacles fora cooling agent. v

7. In a furnace, the combination with a furnace wall having a' recessfacing a heated zone of said furnace; of an endless sectional curtain somounted in said recess as to present an vapproximately flat uprightsurface to solid material in said heated zone;- means for so moving saidcurtain that the sections thereof are successively exposed to said' forsupplying cooling fluid to said structure.

9. The combination in a furnace of a niov ly vertically between pairs ofsaid sprocket Wheels; horizontally extending plate sec- -tionsdetachably secured to said chainsand arranged to form a curtain havingan upright, approximately continuous face exposed to the material in thefurnace,. the curtain constituting one portion of said lining; and meansfor turning the sprocket Wheels to successively expose relatively coolplate sections to the interior of the furnace.v

11. The combination in a furnace .of sprocket wheels mounted one abovethe other adjacent the furnace wall; chains extending approximatelyvertically between pairs of the sprocket wheels; horizontally extendingplate sections mounted on the chains and arranged to constitute acurtain having an upright, approximately continuous'face exposed to thematerial in the furnace; means for turning the sprocket wheels to.successively expose relatively cool plate sections to the interior ofthe furnace and means for supplying a cooling agent to those sectionsexposed to the furnace.

12. The combination in a furnace of a wall; a plate mounted thereinhaving a downwardly projecting flange exposed to the furnace;approximately vertically extending chains mounted undersaid platefhorizontally extending metallic curtain sections mounted on said chainsin an endless series and positioned to present an upright approximatelyflat face to the heated material in the furnace, certain of the sectionsbeing extended in a protected run between said face and the furnacewall; with means for directing, a cooling agent against the flange ofthe plate above the curtain to perm it said agent to fall upon and coolthe exposed sections.

13. In, a furnacethe combination with an ash pocket having means forremoving ash-es from its lower portion; of a traveling sectional,endless curtain having a run positioned to constitute one side of saidash pocket; means for moving the curtain to cause the sections in saidrun to move downwardly; and means for supplying a cooling agent to thesections in the exposed run.

14. The combination in a furnace of an endless curtain constituting aportion of the the sections having a horizontally extended portionprojecting into the furnace; and

means for moving the, curtain to cause the sectionsexposed to the heatof the furnace to. move downwardly.

15. Incombinatlon, a furnace Wall having a horizontal late provided witha depending expoced ange; a pair of shafts; a supporting beam for saidplate provided with a plurality of brackets',having bearings for one ofsaid pair of shafts; a second beam having' a bearing for the other .ofsaid shafts; a curtainnrounted on said shafts so as to. protect theadjacent furnace wall; and means for discharging a cooling 'fiuidagainst said dependingtflange, the latter being so positioned as tocause said fluid to fall on said curtain. o

. 16. In a furnace, the combination with a furnace lining facing aheated zone' thereof; of an endless sectional curtain spaced from saidlining .so as to protect the same but also constituting one portion ofsaid lining; and means for so moving said curtain that the sectionsthereof are successively moved from immediate proximity to "said furnacelining in to positions exposed to said heated zone.

i J L. SCHULTZ.

